No Dan you're not. I managed to tear mine a little while ago. I haven't worried about it as the bike only gets wet if I get caught out and the lever is directly in front of the piston in any case. Can't answer your question about the after market levers though.

ASV.............took me less than 5 minutes per side, everything you need is in the box......bloody brilliant.

The only trouble (Goddam git thing) is that the rubber boots on both sides were partially shagged / spilt (Like most Milles), so it can be a (Goddam) fiddle to get the "rods" in the hole as it were. All other aspects were easy peasy.